/
solar.dart
120 lines (102 loc) · 3.06 KB
/
solar.dart
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import 'package:flutter/material.dart';
import 'dart:math' as math;
void main() {
runApp(MaterialApp(
home: MyApp(),
debugShowCheckedModeBanner: false,
));
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.grey[200],
body: Center(
child: Postman(),
),
);
}
}
class Postman extends StatefulWidget {
@override
_PostmanState createState() => _PostmanState();
}
class _PostmanState extends State<Postman> with SingleTickerProviderStateMixin {
AnimationController animationController;
Animation animation;
@override
void initState() {
animationController =
AnimationController(vsync: this, duration: Duration(seconds: 4));
animation = Tween<double>(begin: 0, end: 2).animate(
CurvedAnimation(parent: animationController, curve: Curves.linear));
animation.addListener(() {
setState(() {});
});
animationController
.forward()
.whenComplete(() => animationController.repeat());
super.initState();
}
@override
Widget build(BuildContext context) {
return CustomPaint(
painter: PostmanPainter(rotationFactor: animation.value),
);
}
}
class PostmanPainter extends CustomPainter {
double rotationFactor;
PostmanPainter({this.rotationFactor});
@override
void paint(Canvas canvas, Size size) {
Offset centerOffset = Offset(size.width / 2, size.height / 2);
Paint innerPaint = Paint()
..color = Colors.orange
..strokeCap = StrokeCap.round
..style = PaintingStyle.fill;
Paint outerPaint = Paint()
..color = Colors.orange
..strokeCap = StrokeCap.round
..style = PaintingStyle.stroke
..strokeWidth = 2.0;
double rotationAngle = rotationFactor * math.pi;
double initialDisplacement = 0.75 * math.pi;
canvas.drawCircle(centerOffset, 20.0, innerPaint);
canvas.drawCircle(centerOffset, 40.0, outerPaint);
canvas.drawCircle(centerOffset, 60.0, outerPaint);
canvas.drawCircle(centerOffset, 80.0, outerPaint);
canvas.drawCircle(
Offset(
size.width / 2 +
40.0 * math.cos(initialDisplacement + rotationAngle * 4),
size.height / 2 +
40.0 * math.sin(initialDisplacement + rotationAngle * 4)),
6.0,
innerPaint);
canvas.drawCircle(
Offset(
size.width / 2 +
60.0 * math.cos(initialDisplacement + rotationAngle * 2),
size.height / 2 +
60.0 * math.sin(initialDisplacement + rotationAngle * 2)),
6.0,
innerPaint);
canvas.drawCircle(
Offset(
size.width / 2 +
80.0 * math.cos(initialDisplacement + rotationAngle),
size.height / 2 +
80.0 * math.sin(initialDisplacement + rotationAngle)),
6.0,
innerPaint);
}
@override
bool shouldRepaint(CustomPainter oldDelegate) {
return true;
}
}